He said: "I found tapioca pudding and I found the tiniest little antique spoon in New Orleans, a little bitty sugar spoon, and I would eat it with that so it would last longer.

"Oh it was great in the morning when I would write from 4-6am with my tapioca pudding. I could make it last an hour."

McConaughey had previously stated that losing weight for the film was one of his toughest challenges to date.

He said: "It was tough going, I'm not going to lie. The dieting was pretty hardcore. I was losing 7lbs every week. I'd have a Diet Coke, two egg whites in the morning, a piece of chicken, then another Diet Coke.

"That was rough. I got down to [143lbs] and I was always hungry, and irritable. My body resembled a little baby bird with its mouth open, crying, 'Feed me, feed me,' and you realise momma bird ain't going to feed you. It's hard."

McConaughey won the SAG Award for Outstanding Male Actor in a Leading Role for Dallas Buyers Club.